PHOTOMULTIPLIER PHOTOMETER for Faster, MORE ACCURATE Operations REGULATED, A-C LINE OPERATED - NO BATTERIES
Increases Slit
Sensitivity
Opening
Fluctuations Blank... . . . More
337 Times...
. . . Eliminates
Decreases
Rapid
. . . Blanks Out High
Flame Ultraviolet
increases W o r k i n g R a n g e of Convenient
. . . More
Spectra
Dependable.
'fâm l y i l Y Monochromafor or ' ^ " ™ ' Spectrophotometer ^;C?#;ii;Wi»Mi| : : . Ronge ^ . » < X > 0 :t||) : •
This is the only available instrument that provides all these special
(DELIVERED ANYWHERE IN U.S.A.)
features: Use of 105 volts per dynode stage —instead of the usual 45 volts. As calculated from R. C. A. Tube Handbook HB-3, Phototube Section, this increases sensitivity 337 times. • In reaction kinetic studies with enzymes, etc. the meter reading allows continuous and rapid readings • Equipped with plug-in for Leeds and Northrup recorder
This type of photomultiplier photometer is in use in the Weichselbaum-Varney Spectrophotometer in the following laboratories:
• Electrical compensation of flame and water background
University of Colorado Medical Center
• An integrating circuit which (for practical purposes) eliminates
Barrett Division—Allied Chemical Company
rapid fluctuations in flame characteristics or rates of atomization • Elimination of need for all electronics and batteries in currently used spectrophotometers, except for the exciter lamp
Philadelphia General Hospital
• Regulated at 115 volts, 60 cycles to within less than 0.25%—when used on any 60 cycle A-C line varying from 95 to 125 volts
UNIQUELY AND
SUITED
VISIBLE
FOR
ULTRAVIOLET
SPECTROPHOTOMETRY
& FLAME
PHOTOMETRY
University of Illinois—Hospital Laboratory Abbott Laboratories
University of Louisville University of Washington Washington University — Department of Physiology University of North Carolina —School of Medicine L o u i s i a n a S t a t e U ni v e r s i f y — School of M e d i c i n e
Missouri Research L a b o r a t o r i e s - D E P T . A 2109
Locust
Street
- St. L o u i s ,
Missouri
For further information, circle number 26 A on Readers' Service Card, page 49 A
26 A
ANALYTICAL
CHEMISTRY
